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This is to make the use of HeaderView consistent between
browser and non browser windows.

Bug: 1126857
Change-Id: I453ae3c063e93276f6ec9da0aae05244d5e28ed5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363504
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812631}